Add a pieces few leaves of red cabbage into a beaker of hot water. The leaves will decolourise and the solution will eventually turn purple. We will use this solution as the indicator. Add 2 drops into different samples and observe for colour change.

You can encourage students’ participation by allowing them to bring their own samples. Students generally are more excited to work on stuff that they contributed.

You can also extend this activity by giving them time to make their own indicator paper which they can bring home. Simply cut strips of filter paper, soak it in red cabbage juice and let it air dry. Students can then use them by dipping it into samples.

Conducted a simple titration for a lesson on Acid Rain. Parts of lesson is scenario-based to provide solution for acidic soil.

Level: Sec 2 Normal Technical
Topic: Air Pollution (Effects of Air Pollution – Acid Rain)
Objectives:
Students should be able to:
– test for pH of solution using universal indicator
– test for acidity or alkalinity of solution using pH paper
– conduct simple titration and determine the end-point for neutralisation

There was no update about it about until today. Investigations by National Environment Agency (NEA) shows that the source of the water pollution is chemical illegally discharged by a construction firm, Singbuild. The firm was fned a total of $7,000 for illegal dumping industrial waste and debris into drains.